MULTI-SECTION APPARATUS FOR IMPROVING SIGNAL TRANSMISSION THROUGH TELEPHONE TRANSMISSION LINES

摘要

An apparatus for providing simultaneously a multiplicity of independent non-interactive effects on the transmission characteristics of a voice-frequency telephone transmission line. Output voltage and current signal processing circuitry is provided which generates voltages for insertion in series with the line and currents for insertion in shunt with the line. Input voltage and current signal processing circuitry is also provided to sense the signal voltage across and the signal current through the transmission line and to generate a multiplicity of voltages and currents which are functions of the signal voltage and the signal current as well as of the voltages and currents fed back from the output signal processing circuitry to the input signal processing circuitry. A multiplicity of line conditioning control units couple the input signal processing circuitry to the output signal processing circuitry. Each line conditioning control unit is adapted to affect the transmission characteristics of the line without interferring with the effects simultaneously provided by the other line conditioning control units.